| 1 | /* $Header$ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright (c) 1988-1997 Sam Leffler |
| 5 | * Copyright (c) 1991-1997 Silicon Graphics, Inc. |
| 6 | * |
| 7 | * Permission to use, copy, modify, distribute, and sell this software and |
| 8 | * its documentation for any purpose is hereby granted without fee, provided |
| 9 | * that (i) the above copyright notices and this permission notice appear in |
| 10 | * all copies of the software and related documentation, and (ii) the names of |
| 11 | * Sam Leffler and Silicon Graphics may not be used in any advertising or |
| 12 | * publicity relating to the software without the specific, prior written |
| 13 | * permission of Sam Leffler and Silicon Graphics. |
| 14 | * |
| 15 | * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND, |
| 16 | * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY |
| 17 | * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. |
| 18 | * |
| 19 | * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR |
| 20 | * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND, |
| 21 | * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, |
| 22 | * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF |
| 23 | * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE |
| 24 | * OF THIS SOFTWARE. |
| 25 | */ |
| 26 | |
| 27 | /* |
| 28 | * TIFF Library. |
| 29 | * |
| 30 | * Various routines support external extension of the tag set, and other |
| 31 | * application extension capabilities. |
| 32 | */ |
| 33 | |
| 34 | #include "tiffiop.h" |
| 35 | #include <assert.h> |
| 36 | |
| 37 | int TIFFGetTagListCount( TIFF *tif ) |
| 38 | |
| 39 | { |
| 40 | TIFFDirectory* td = &tif->tif_dir; |
| 41 | |
| 42 | return td->td_customValueCount; |
| 43 | } |
| 44 | |
| 45 | ttag_t TIFFGetTagListEntry( TIFF *tif, int tag_index ) |
| 46 | |
| 47 | { |
| 48 | TIFFDirectory* td = &tif->tif_dir; |
| 49 | |
| 50 | if( tag_index < 0 || tag_index >= td->td_customValueCount ) |
| 51 | return (ttag_t) -1; |
| 52 | else |
| 53 | return td->td_customValues[tag_index].info->field_tag; |
| 54 | } |
| 55 | |
| 56 | /* |
| 57 | ** This provides read/write access to the TIFFTagMethods within the TIFF |
| 58 | ** structure to application code without giving access to the private |
| 59 | ** TIFF structure. |
| 60 | */ |
| 61 | TIFFTagMethods *TIFFAccessTagMethods( TIFF *tif ) |
| 62 | |
| 63 | { |
| 64 | return &(tif->tif_tagmethods); |
| 65 | } |
| 66 | |
| 67 | void *TIFFGetClientInfo( TIFF *tif, const char *name ) |
| 68 | |
| 69 | { |
| 70 | TIFFClientInfoLink *link = tif->tif_clientinfo; |
| 71 | |
| 72 | while( link != NULL && strcmp(link->name,name) != 0 ) |
| 73 | link = link->next; |
| 74 | |
| 75 | if( link != NULL ) |
| 76 | return link->data; |
| 77 | else |
| 78 | return NULL; |
| 79 | } |
| 80 | |
| 81 | void TIFFSetClientInfo( TIFF *tif, void *data, const char *name ) |
| 82 | |
| 83 | { |
| 84 | TIFFClientInfoLink *link = tif->tif_clientinfo; |
| 85 | |
| 86 | /* |
| 87 | ** Do we have an existing link with this name? If so, just |
| 88 | ** set it. |
| 89 | */ |
| 90 | while( link != NULL && strcmp(link->name,name) != 0 ) |
| 91 | link = link->next; |
| 92 | |
| 93 | if( link != NULL ) |
| 94 | { |
| 95 | link->data = data; |
| 96 | return; |
| 97 | } |
| 98 | |
| 99 | /* |
| 100 | ** Create a new link. |
| 101 | */ |
| 102 | |
| 103 | link = (TIFFClientInfoLink *) _TIFFmalloc(sizeof(TIFFClientInfoLink)); |
| 104 | assert (link != NULL); |
| 105 | link->next = tif->tif_clientinfo; |
| 106 | link->name = (char *) _TIFFmalloc(strlen(name)+1); |
| 107 | assert (link->name != NULL); |
| 108 | strcpy(link->name, name); |
| 109 | link->data = data; |
| 110 | |
| 111 | tif->tif_clientinfo = link; |
| 112 | } |